View source for G.91 R/4

{{About
| about = premium Italian jet fighter '''{{PAGENAME}}'''
| usage = other versions
| link = G.91 (Family)
}}
{{Specs-Card
|code=fiat_g91_r4
|images={{Specs-Card-Image|GarageImage_G.91_R4.jpg}}
}}

== Description ==
<!-- ''In the description, the first part should be about the history of and the creation and combat usage of the aircraft, as well as its key features. In the second part, tell the reader about the aircraft in the game. Insert a screenshot of the vehicle, so that if the novice player does not remember the vehicle by name, he will immediately understand what kind of vehicle the article is talking about.'' -->
The '''{{Specs|name}}''' is a premium rank {{Specs|rank}} Italian jet fighter {{Battle-rating}}. It was introduced in [[Update 1.87 "Locked On"]] as a [[wt:en/news/6078-development-g-91ys-turning-and-burning-en|pack vehicle]] purchasable in the Gaijin Store, but was removed from sale after the [[wt:en/news/7154-shop-may-sale-in-the-gaijin-store-en|2021 May Sale]]. It later returned for purchase for Golden Eagles {{ge}} in [[Update "Red Skies"]].

The R/4 is a variant of the G.91 jet fighter that has been modified for ground attack, allowing it access to a competitive selection of air-to-ground ordnance such as bombs, rockets, and high-explosive air-to-ground missiles. The R/4 also has the option to equip two different types of air-to-air missiles: the IR-tracking [[AIM-9B Sidewinder]] missile, or the command-guided [[AA-20 Nord]] missile.

The G.91 R/4 is a very nimble fighter with relatively average top speed and fairly good acceleration. Best played as a support fighter, the G.91 R/4 can use its incredible roll and turn rates to quickly get guns on target, as well as to dodge the typically less manoeuvrable fighters that it shares its battle ratings with.

There are few changes between the [[G.91 pre-serie|Pre-serie]], [[G.91 R/1|R/1]], [[G.91 R/3|R/3]] and the [[G.91 R/4|R/4]], with exception of the armament, and this guide can be considered universal for all listed aircraft.

== General info ==
=== Flight performance ===
{{Specs-Avia-Flight}}
<!-- ''Describe how the aircraft behaves in the air. Speed, manoeuvrability, acceleration and allowable loads - these are the most important characteristics of the vehicle.'' -->
The G.91 was intended to replace the [[F-86A-5|F-86A Sabre]] in German, Portuguese and Italian service, and it shows. With an empty weight of only 3,100 kg (6,800 lbs) and a takeoff weight of 5,500 kg (12,100 lbs), the Gina is in the weight class as the [[P-51D-5|P-51D]] and [[MiG-9]], yet severely lighter than most other jets and losing about one and a half tonnes compared to the Sabre A.

Although only outputting a meagre 22 kN of thrust, this first look disadvantage is literally outweighed by the high thrust to weight ratio of 0.73 empty (0.41 full). This makes the Gina an excellent dogfighter as jet fighters maintain their top speed, climb rate, and sustained turn-rate by their engine power rather than other flight characteristics. It can easily reach its own terminal speed (1,011 km/h, 921 ft/s) and self-destruct in level flight.

Lacking in straight wings and leading wing slats, the stall speed for the G.91 is higher than the low weight leads one to assume. One should hence be wary of many older jet types with said features, as after bleeding too much speed they can easily out-manoeuvre the Gina.

Starting with 20 min of fuel, gaining the climb speed of 800 km/h IAS (sustainable @ 7-8°; 730 ft/s) takes a mere ~80 seconds with 20 predicated for taking off at 230 km/h or 210 ft/s IAS. An Immelmann at 800 km/h will gain 1,000 m and lose 300 km/h. A hard 180° turn at the same speed takes >100 km/h and may lose up to 60 m.

{| class="wikitable" style="text-align:center" width="70%"
! rowspan="2" | Characteristics
! colspan="2" | Max Speed<br>(km/h at 0 m - sea level)
! rowspan="2" | Max altitude<br>(metres)
! colspan="2" | Turn time<br>(seconds)
! colspan="2" | Rate of climb<br>(metres/second)
! rowspan="2" | Take-off run<br>(metres)
|-
! AB !! RB !! AB !! RB !! AB !! RB
|-
! Stock
| 1,066 || 1,042 || rowspan="2" | {{Specs|ceiling}} || 27.4 || 28.0 || 30.4 || 29.5 || rowspan="2" | 850
|-
! Upgraded
| 1,097 || 1,084 || 24.8 || 26.0 || 49.3 || 39.0
|-
|}

==== Details ====
{| class="wikitable" style="text-align:center" width="50%"
|-
! colspan="6" | Features
|-
! Combat flaps !! Take-off flaps !! Landing flaps !! Air brakes !! Arrestor gear !! Drogue chute
|-
| ✓ || ✓ || ✓ || ✓ || X || ✓     <!-- ✓ -->
|-
|}

{| class="wikitable" style="text-align:center" width="50%"
|-
! colspan="7" | Limits
|-
! rowspan="2" | Wings (km/h)
! rowspan="2" | Gear (km/h)
! colspan="3" | Flaps (km/h)
! colspan="2" | Max Static G
|-
! Combat !! Take-off !! Landing !! + !! -
|-
| {{Specs|destruction|body}} || {{Specs|destruction|gear}} || 589 || 550 || 345 || ~11 || ~5
|-
|}

{| class="wikitable" style="text-align:center"
|-
! colspan="4" | Optimal velocities (km/h)
|-
! Ailerons !! Rudder !! Elevators !! Radiator
|-
| < 800 || < 650 || < 660 || N/A
|-
|}

==== Engine performance ====
{| class="wikitable" style="text-align:center"
|-
! colspan="3" | Engine
! colspan="5" | Aircraft mass
|-
! colspan="2" | Engine name || Number
! colspan="2" | Empty mass || colspan="3" | Wing loading (full fuel)
|-
| colspan="2" | Bristol Orpheus MK.803 || 1
| colspan="2" | 3,477 kg || colspan="3" | 289 kg/m<sup>2</sup>
|-
! colspan="3" | Engine characteristics
! colspan="4" | Mass with fuel (no weapons load) || rowspan="2" | Max Takeoff<br />Weight
|-
! Weight (each) || colspan="2" | Type
! 9m fuel || 20m fuel || 30m fuel || 32m fuel
|-
| 380 kg || colspan="2" | Axial-flow turbojet
| 3,837 kg || 4,269 kg || 4,662 kg || 4,740 kg || 5,800 kg
|-
! colspan="3" | {{Annotation|Maximum engine thrust @ 0 m (RB / SB)|The maximum thrust produced by each engine, while mounted in the aircraft. NOTE: Thrust varies significantly depending on speed & altitude.}}
! colspan="5" | Thrust to weight ratio @ 0 m (101%)
|-
! Condition || 100% || 101%
! 9m fuel || 20m fuel || 30m fuel || 32m fuel || MTOW
|-
| ''Stationary'' || 2,212 kgf || 2,234 kgf
| 0.58 || 0.52 || 0.48 || 0.47 || 0.39
|-
| ''Optimal'' || 2,212 kgf<br />(0 km/h) || 2,234 kgf<br />(0 km/h)
| 0.58 || 0.52 || 0.48 || 0.47 || 0.39
|-
|}

=== Survivability and armour ===
{{Specs-Avia-Armour}}
<!-- ''Examine the survivability of the aircraft. Note how vulnerable the structure is and how secure the pilot is, whether the fuel tanks are armoured, etc. Describe the armour, if there is any, and also mention the vulnerability of other critical aircraft systems.'' -->

* 40 mm Bulletproof glass in front of the pilot
* 6.5 mm Steel plate, starts in the pilot's seat, goes below the pilot, ends in front of the pilot
* 6.5 mm Steel plate below a fuel tank in the centre-front of the fuselage
* 6.5 mm Steel plate below a fuel tank in the centre-rear of the fuselage
* Self-sealing fuel tanks (6 mid-fuselage)

Though the G.91 R/4 does have a decent amount of armour spaced out between the centre and front of the fuselage, the steel plates will only be sufficient to protect the pilot and aircraft from lower calibre fire (7.92 mm to 7.62 mm machine guns will only penetrate at '''very''' close ranges). And, thanks to the sacrifices made to lighten the aircraft, the airframe is not particularly reinforced. The wings are very thin and susceptible to being out-right broken off by most-all primary armaments the G.91 will face at its tier, and the fuselage is full of juicy fuel tanks as well as the single engine of the R/4. Even more so than most planes, the G.91 R/4 is not capable of taking any hits. Even low calibre fire, such as that from .50 cal machine guns, can cripple an R/4 nigh-immediately and necessitate an immediate return-to-base.

=== Modifications and economy ===
{{Specs-Economy}}

== Armaments ==
{{Specs-Avia-Armaments}}
=== Suspended armament ===
{{Specs-Avia-Suspended}}
<!-- ''Describe the aircraft's suspended armament: additional cannons under the wings, bombs, rockets and torpedoes. This section is especially important for bombers and attackers. If there is no suspended weaponry remove this subsection.'' -->

The '''''{{PAGENAME}}''''' can be outfitted with the following ordnance:

{| class="wikitable" style="text-align:center" width="100%"
|-
! !! width="6%" | 1 !! width="6%" | 2 !! width="6%" | 3 !! width="6%" | 4 !! width="6%" | 5 !! width="6%" | 6
| rowspan="10" width="30%" | <div class="ttx-image">[[File:Hardpoints_G.91_R-4.png]]</div>
|-
! [[M3 Browning (12.7 mm)|12.7 mm M3 Browning]] machine guns (300 rpg)
| || || 2 || 2* || ||
|-
! [[AN-M64A1 (500 lb)|500 lb AN-M64A1]] bombs
| || 1 || || || 1 ||
|-
! [[Mk 82 Snakeye (500 lb)|500 lb Mk 82 Snakeye]] bombs
| || 1 || || || 1 ||
|-
! [[Aerea 559G1 incendiary]] bombs
| || 1 || || || 1 ||
|-
! [[FFAR Mighty Mouse]] rockets
| || 19 || || || 19 ||
|-
! [[AA-20 Nord]] missiles
| 1* || 1* || || || 1* || 1*
|-
! [[AIM-9B Sidewinder]] missiles
| 1 || 1 || || || 1 || 1
|-
! [[AS-20 Nord]] missiles
| 1* || 1* || || || 1* || 1*
|-
| colspan="7" | Maximum permissible weight imbalance: 390 kg
|-
| colspan="8" | * MCLOS missiles cannot be carried in conjunction with machine guns on hardpoint 4
|}

{{Navigation-Start|Default weapon presets}}
{{Navigation-First-Simple-Line}}
* 4 x 12.7 mm M3 Browning machine guns (300 rpg = 1,200 total)
* 2 x 12.7 mm M3 Browning machine gun + 4 x AA-20 Nord missiles
* 4 x 12.7 mm M3 Browning machine guns + 4 x AIM-9B Sidewinder missiles
* 4 x 12.7 mm M3 Browning machine guns + 38 x FFAR Mighty Mouse rockets
* 2 x 12.7 mm M3 Browning machine gun + 4 x AS-20 Nord missiles
* 4 x 12.7 mm M3 Browning machine guns + 2 x 500 lb AN-M64A1 bombs (1,000 lb total)
* 4 x 12.7 mm M3 Browning machine guns + 2 x 500 lb Mk 82 Snakeye bombs (1,000 lb total)
* 4 x 12.7 mm M3 Browning machine guns + 2 x Aerea 559G1 incendiary bombs
{{Navigation-End}}

Featuring a wide range of ordnance, the G.91 R/4 can be equipped for any role from ground to air combat, though it prefers air superiority.

The M3 Browning is a new weapon in the Italian arsenal at rank V and, compared to the previous experiences, a let down. The rate of fire is phenomenal, but the small calibre and ammo size put a serious damper to the mood, that is in comparison of course. In practise and with good aim, it can easily shred four fighters. The high bullet velocity and fire rate is quite the advantage in the fast pace world of jet combat, ensuring hits in deflection shots where the lower rate of fire found in the [[:Category:Fifth_rank_aircraft|Soviet jet fighters]] might have failed the pilot.

Yet one will always look onto greener pastures, especially as the Gina only has four guns unlike all other Browning armed jets. No matter how you turn it, the armament is only manageable with skill and outright bad for a beginner.

For air-to-ground purposes, the G.91 R/4 is similar to the [[G.91 pre-serie]] and [[G.91 R/1]], both its predecessors, in loadout options, sharing the same FFAR Mighty Mouse rocket option as well as the choice of a pair of 500 lb bombs. However, the G.91 R/4 has an additional and unique option: the AS-20 Nord air-to-ground missile, with a reasonable penetration value (83 mm RHAe) but incredible warhead size of (just under) 30 kg of TNT. Skilled use of the missile can allow for a more accurate fire at longer ranges especially versus more dangerous vehicles like self-propelled anti-aircraft guns.

Air-to-air ordnance selection is where the G.91 R/4 stands out from its brethren; the G.91 R/4 is the lowest-ranked jet in the Italian aircraft tree to gain access to air-to-air missiles, with access to the American AIM-9B infrared-guided missile, and one of only two jets in-game (alongside the [[Super Mystere B2|Super Mystére B.2]]) to have the option of loading the unique AA-20 Nord air-to-air missiles; keyboard guided missiles with a 15 metre proximity fuse. Unlike infrared-guided missiles in War Thunder, the AA-20 Nords do not warn targets of a missile launch giving R/4 pilots the element of surprise, and the Nord's proximity fuse increases the chance of long-range launches striking a target, though these perks come at the demand of a much higher skill floor for usage.

== Usage in battles ==
<!-- ''Describe the tactics of playing in the aircraft, the features of using aircraft in a team and advice on tactics. Refrain from creating a "guide" - do not impose a single point of view, but instead, give the reader food for thought. Examine the most dangerous enemies and give recommendations on fighting them. If necessary, note the specifics of the game in different modes (AB, RB, SB).'' -->
Due to the G.91 R/4's notably lower speed and high-end acceleration as compared to its contemporaries, the R/4 should be played as a support fighter, meaning the pilot should seek to stick near teammates rather than hunting targets solo, and opt to pick off hostile aircraft that are engaged and distracted with/by allied fighters. The G.91 airframe is exceptionally agile, and the R/4 is no exception; even heavily manoeuvring targets are easy for this plane to keep the nose on. The plane's exceptional roll and turn rates are its biggest strengths, and the pilot should seek to use that to their advantage rather than attempting to fight speed or energy battles.

Make use of the G.91 R/4's varied suspended armaments to dispatch a variety of targets. The AIM-9B is a very easy to use missile and can force faster targets to manoeuvre, slowing them down, and can sometimes even net target destructions. Be careful when using this missile around friendlies though, as a misguided Sidewinder '''will''' destroy allied aircraft. The AA-20 Nord is a much more difficult missile to use, but it has a far longer effective range and can often surprise enemies who expect a warning from enemy missile launches. Use the massive range and proximity fuse to take down faster targets flying away from you, and consider using them to destroy bombers such as the often-seen [[S.O.4050_Vautour_IIB|Vautour IIB]], [[S.O.4050_Vautour_IIA|Vautour IIA]], and [[Vautour_IIA_IDF/AF_(France)|Israeli Vautour IIA]], who not only are far less able to dodge missiles but also have larger airframes that trigger the proximity fuse from longer distances.

=== Pros and cons ===
<!-- ''Summarise and briefly evaluate the vehicle in terms of its characteristics and combat effectiveness. Mark its pros and cons in the bulleted list. Try not to use more than 6 points for each of the characteristics. Avoid using categorical definitions such as "bad", "good" and the like - use substitutions with softer forms such as "inadequate" and "effective".'' -->

'''Pros:'''

* Exceptional manoeuvrability, with very high roll and turn rates
* Varied and effective suspended armament choices
* Access to air-to-air missiles, including the [[AA-20|AA-20 Nord]]
* Access to the [[AS-20|AS-20 Nord]] air-to-ground missile

'''Cons:'''

* Relatively low calibre primary armament (four .50 cal Brownings)
* Slower than most of its contemporaries
* Very fragile airframe
* Poor energy retention

== History ==
<!-- ''Describe the history of the creation and combat usage of the aircraft in more detail than in the introduction. If the historical reference turns out to be too long, take it to a separate article, taking a link to the article about the vehicle and adding a block "/History" (example: <nowiki>https://wiki.warthunder.com/(Vehicle-name)/History</nowiki>) and add a link to it here using the <code>main</code> template. Be sure to reference text and sources by using <code><nowiki><ref></ref></nowiki></code>, as well as adding them at the end of the article with <code><nowiki><references /></nowiki></code>. This section may also include the vehicle's dev blog entry (if applicable) and the in-game encyclopedia description (under <code><nowiki>=== In-game description ===</nowiki></code>, also if applicable).'' -->
The story of the Fiat G.91 R/4 began during the late stages of the Cold War, with the first pre-serie G.91s being tested in Italy. NATO had set up a competition between nations, in the hopes that all NATO members would share the same aircraft to facilitate the overall structure of NATO member air forces. Having access to the same aircraft en mass would have benefited the alliance in many ways, such as the availability of spare parts, NATO pilots being able to operate the same aircraft (meaning that in the event of war there would always be trained pilots available to operate the aircraft), and overall saving a lot of time and money. The original competition specifications which NATO outlined called for a jet able to carry up to 450 kg of ordnance, an operational radius of 180 km, with a maximum speed of at least Mach 0.95 and a takeoff distance of no more than 1,100 m, on unprepared or grass runways. For this, a lot of nations had decided to take part, mainly because it would result in an influx of financial support. Overall from all the nations that had decided to participate, 8 aircraft competed. This would include aircraft such as the French Dassault [[Etendard IVM|Etendard]] (then called the Mystere XXVI), the British Folland Gnat and the Italian Aerfer [[Sagittario 2]] which would ultimately lose to the G.91. During the competition, a lot of aircraft would not pass to the next stages of the competition. The G.91 among some other aircraft were selected for the second round beginning in late 1957. The Italian Air Force was already showing interest despite the NATO competition still ongoing, eventually Fiat went ahead with a small batch of 27 pre-production ("pre-serie" in Italian) aircraft, with the first flight of the G.91 being completed in August 1956, seven months ahead of its competitors. Sadly, during testing the first prototype of the G.91 would crash due to aeroelastic vibrations in February 1957. Although this proved to be a setback, it did not stop the interest from the Italian Air Force, and the G.91 would still enter the second round of the NATO competition as scheduled, shortly thereafter announced as the winner in January 1958. After extensive testing of the Fiat G.91, and some refinement to the design, the first official major order from the Italian government would arrive, which initially ordered 23 examples of the production version of the G.91.

The production version of the Fiat G.91 was the G.91 R, which was specifically intended for both close air support and photo-reconnaissance. It was armed with 4 x 12.7 mm Browning M3 machine guns which would be placed in the front of the aircraft. It also had 2 pylons which were able to carry a multitude of payload options, which included unguided rockets and bombs. The first production aircraft would be completed by 1959, and the R/1 entered Italian Air Force service with 14th Gruppo in March 1961. In total, 48 of this model would be built. Later on, 2 new variants of the G.91 R/1 would appear, called G.91 R/1A and G.91 R1/B, these would be extensively upgraded and had a reinforced airframe, updated avionics and stronger air-brakes. One of the many things that this new version of the G.91 could do was allow the installation of AS-20 Nords, which would be extensively trialled by the Italian Air Force, and later on applied to more advanced G.91 variants.

The overwhelming success of the G.91 in Italian service would further convince other NATO alliance members to begin to place orders, one of them being Germany. Germany had shown great interest in the aircraft, mainly due its great flight characteristics and the ability to modify the aircraft to suit a nation's operational needs. Thus, Germany would order 50 examples of the G.91 R/3. The G.91 R/3 was a modified version of G.91, removing the Browning .50 cal machine guns in favour for 2 x 30 mm DEFA cannons, included with that would be the improved avionics package that were present on the G.91 R/1A and R/1B, allowing the installation of AS-20 Nords. Lastly the R/3 would receive 2 more pylons, which would give the aircraft a total of 4 pylons. Germany had liked this version so much so that they decided to buy the rights to produce this aircraft, which spawned another 294 versions built in Germany.

Eventually the R/3 would lead to the R/4, a hybrid version of both the G.91 R/1 and G.91 R/3, which would keep the advanced avionics and pylons from the R/3 but would instead revert back to the 4 Browning machine guns from the R/1. As previously stated, many NATO member would be interested, the R/4 was supposed to have been sold to the nations of Greece and Turkey, but after the USA stepped in and offered their aircraft and a cheaper price, the sale fell through and ended up entering West German service instead. However what makes the R/4 well known was mainly due to the extensive service it had inside of the Portuguese Air Force (Força Aérea Portuguesa) during their colonial wars against Angola, Mozambique, and other domains of the former Portuguese empire. Portugal had interest in the aircraft, they'd get 110 of them surplus from Germany. They'd partially put it in service to replace the obsolete [[F-84 (Family)|F-84 Thunderjets]] and [[F-86 (Family)|F-86 Sabres]] that they had in service. The Portuguese Air Force would be the only user of the G.91 series of vehicles to actually use in active combat, the first Portuguese air group to enter active service with the new aircraft was the "121st Tigres Squadron" commanded by Lieutenant Egídio Lopes in April of 1966 in Bissalanca, Guinea. The department commanded by Lopes thus formed a quick reaction force done to support the action of the land units in counter-guerrilla operations, which at times also provided them photo reconnaissance missions, starting from the last quarter of 1966 when the G.91 reached an acceptable level of operational readiness. The G.91 R/4 was liked by its users, so much so that the aircraft had been given the nickname of 'Gina' in Portuguese service, the nickname is still popular nowadays with many ex-servicemen whom operated the G.91.

== Media ==
<!-- ''Excellent additions to the article would be video guides, screenshots from the game, and photos.'' -->

;Skins

* [https://live.warthunder.com/feed/camouflages/?vehicle=fiat_g91_r4 Skins and camouflages for the {{PAGENAME}} from live.warthunder.com.]

;Images
<gallery mode="packed-hover" heights="200">
File:G91 R4.png|<small>Left side of the G.91 R/4</small>
File:G91 R4 2.png|<small>Nose of the G.91 R/4</small>
</gallery>

;Videos
{{Youtube-gallery|aMOb7dfH6ZI|'''"G.91 R/4 "Portuguese Devil" - Update 1.87 Premium"''' by ''BaconGaming''|4wIDFwbBb74|'''"G.91 R/4 - Like A Cold Pizza"''' by ''NapalmRatte''}}

== See also ==
<!-- ''Links to the articles on the War Thunder Wiki that you think will be useful for the reader, for example:''
* ''reference to the series of the aircraft;''
* ''links to approximate analogues of other nations and research trees.'' -->

* [[G.91 (Family)]]

== External links ==
<!-- ''Paste links to sources and external resources, such as:''
* ''topic on the official game forum;''
* ''other literature.'' -->

* [https://forum.warthunder.com/index.php?/topic/363988-fiat-g91-discussion-thread/ WT Forum: Fiat G.91 discussion thread]
* [[wikipedia:Fiat_G.91|[Wikipedia] Fiat G.91]]
* [https://store.gaijin.net/story.php?title=Fiat-G-91-R%2F4-Pack Fiat G.91 R/4 Pack (Gaijin.Net Store)]

{{AirManufacturer Fiat}}
{{Italy jet aircraft}}
{{Italy premium aircraft}}